Synthesis and characterization of supported silica nano hollow spheres with CdS quantum dots

Rafati, Amir Abbas; Borujeni, Ahmadreza Afraz; Najafi, Mojgan; Hajian, Ali

doi:10.1016/j.molliq.2012.07.031

Cited by 14 publications

(5 citation statements)

References 36 publications

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“…29 The appearance of the peak at 1090 cm −1 in the spectrum (b) verifies Si-O-Si bond which refers to silica coating on the MNPs surface. 30 Characteristic Hb peaks at 1627 and 1562 cm −1 , corresponding to amide I and amide II stretching modes in Hb, 31 respectively, were apparent in spectrum c that clearly verifies the Hb immobilization onto modified MNPs. MNPs since it is approximately between the isoelectric point of Hb and silica coating of MNPs.…”

Section: Instrumental Investigation Of Mnps Synthesis Modification Andmentioning

confidence: 75%

Electrostatically Immobilized Hemoglobin on Silica-Coated Magnetic Nanoparticles for Simultaneous Determination of Dopamine, Uric Acid, and Folic Acid

Ghodsi

Hajian

Rafati

et al. 2016

J. Electrochem. Soc.

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This work describes the development of a novel biosensor for simultaneous determination of dopamine, uric acid, and folic acid by carbon paste electrode modified by hemoglobin which is electrostatically immobilized on silica-coated magnetic nanoparticles and multi-walled carbon nanotubes. Peroxidase properties of hemoglobin nominate this protein as an abundant and inexpensive alternative for costly peroxidase enzymes in dopamine biosensor fabrication. Silica-coated nanoparticles of Fe 3 O 4 as a suitable support for hemoglobin immobilization can enhance the loading and stability of hemoglobin. Magnetic nanoparticles were synthesized via a simple co-precipitation method and then were coated with silica to immobilize hemoglobin electrostatically on them. All synthesis and modification steps were characterized by different techniques and then the conditions of hemoglobin immobilization on magnetic nanoparticles were optimized. Multi-walled carbon nanotubes were used as an additional modifier of carbon paste electrode because of their high electroactive surface area and interesting electrocatalytic properties. The modified carbon paste electrode provided a sensitive and stable biosensor for simultaneous determination of dopamine, uric acid, and folic acid whose performance is much better than those of many previously reported sensors. The detection limits were calculated to be about 12 nM, 14 nM and 18 nM and the linear range for determination of DA, UA and FA are 1-30.6 μM, 1-286 μM and 1-369 μM, for dopamine, uric acid, and folic acid, respectively. Finally, the applicability of the proposed biosensor was verified by dopamine evaluation in serum samples.

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Section: Instrumental Investigation Of Mnps Synthesis Modification Andmentioning

confidence: 75%

Electrostatically Immobilized Hemoglobin on Silica-Coated Magnetic Nanoparticles for Simultaneous Determination of Dopamine, Uric Acid, and Folic Acid

Ghodsi

Hajian

Rafati

et al. 2016

J. Electrochem. Soc.

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“…As the Gibbs free energy of the surface is usually quite high due to a large surface/volume ratio, freshly formed CdS nanoparticles have a tendency to aggregate on a support to become stable [23]. In the above suggested formation mechanism H 2 S is gradually released preventing the rapid reaction between S −2 and Cd +2 , thus restricting the growth of CdS nanoparticles.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of CdS nanorods by combined sonochemical-solvothermal method

Bozkurt

Derkuş

2016

Materials Science-Poland

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Cadmium sulfide (CdS) nanorods with a diameter of 50 nm and length of approximately 200 nm have been synthesized using combined sonochemical-solvothermal method. Structural properties of CdS nanoparticles synthesized by this method have been compared with the CdS nanoparticles synthesized by sonochemical method alone. The synthesized CdS nanostructures have been characterized using X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX) and transmission electron microscopy (TEM) methods. In addition, the factors affecting the formation of the structures, including reaction time, different type and ratio of precursors, such as sulphur source, have been investigated. Comparison of the results obtained by both the synthesis methods revealed CdS nanoparticles synthesized by the combined sonochemical-solvothermal method to be of high morphological homogeneity compared to the sonochemical method alone. It is interesting to note that ethylenediamine has been found to be prevented from agglomeration by using the combined sonochemical-solvothermal method as the synthesis method. A modified growth mechanism under the inducement of ethylenediamine solutions for the CdS nanorods has been suggested.

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Section: Single Detection Based On Qd-flisamentioning

confidence: 99%

“…The coating of the silicon shell not only makes QDs biocompatible, but also protects the QDs in the core from environmental influences, increasing their stability and reducing their toxicity. 143,144 In a word, the surface modification strategies allow QDs to attain biocompatibility with high PL QYs and high stability, laying a foundation for using QDs as fluorescent probes. For assays, the optimization of probe material properties is an important aspect to improve the performance of QD-FLISA assays: first, the synthesis of high-quality hydrophobic QDs and the acquisition of biocompatible aqueous QDs by optimizing the conditions and controlling the fluorescence quenching during the process of surface modification.…”

Section: Single Detection Based On Qd-flisamentioning

confidence: 99%

Recent advances in quantum dot-based fluorescence-linked immunosorbent assays

Fan

Zhao

et al. 2023

Nanoscale

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Synthesis and characterization of supported silica nano hollow spheres with CdS quantum dots

Cited by 14 publications

References 36 publications

Electrostatically Immobilized Hemoglobin on Silica-Coated Magnetic Nanoparticles for Simultaneous Determination of Dopamine, Uric Acid, and Folic Acid

Electrostatically Immobilized Hemoglobin on Silica-Coated Magnetic Nanoparticles for Simultaneous Determination of Dopamine, Uric Acid, and Folic Acid

Synthesis and characterization of CdS nanorods by combined sonochemical-solvothermal method

Recent advances in quantum dot-based fluorescence-linked immunosorbent assays

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